Date Range Calculator
Calculate the period between two dates in various units
Enter Date Ranges
Date Range Calculator Guide
📅What is Date Range Calculation?
Calculate the period between two dates in various units (days, weeks, months, years). Used in various fields including project schedules, contract periods, and pregnancy weeks.
- Exact number of days between start and end dates
- Automatic conversion to weeks, months, years
- Separate display of work days and weekend days
🧮Period Calculation Method
Date range calculation shows the difference between two dates in various units. Leap years and varying days per month are automatically reflected.
- Days: End date - Start date + 1
- Weeks: Days ÷ 7
- Months/Years: Calendar-based calculation
Date Range Calculation Use Cases
Project Duration Calculation
Accurately track the period from project start to deadline
Pregnancy Week Calculation
Check the pregnancy period from the last menstrual date to now
Contract/Employment Period Calculation
Calculate contract duration, tenure, vacation days, etc.
Frequently Asked Questions
Yes, both start and end dates are included in the period. Example: Jan 1 ~ Jan 3 = 3 days
Only weekdays excluding Saturday and Sunday are counted as work days. Holidays are not separately reflected.
Calculated based on actual calendar days. 28, 30, and 31 day months are accurately reflected.
Yes, leap years with February 29 are automatically reflected in calculations.
Yes, click the 'Add Range' button to calculate and compare multiple date ranges simultaneously.
💡 Date Calculation Tips
Work backwards from the deadline to plan each milestone date.
Check special anniversaries like D-100 or D-1000 in advance.
Include buffer periods when planning important schedules.